diff --git a/skeletons/Makefile.in b/skeletons/Makefile.in
index a858653..53ddc10 100644
--- a/skeletons/Makefile.in
+++ b/skeletons/Makefile.in
@@ -76,6 +76,8 @@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CONFIGURE_DEPENDS = @CONFIGURE_DEPENDS@
+CPLUSPLUS_FOUND_FALSE = @CPLUSPLUS_FOUND_FALSE@
+CPLUSPLUS_FOUND_TRUE = @CPLUSPLUS_FOUND_TRUE@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CXX = @CXX@
diff --git a/skeletons/tests/Makefile.in b/skeletons/tests/Makefile.in
index 582a3f5..dbac6f7 100644
--- a/skeletons/tests/Makefile.in
+++ b/skeletons/tests/Makefile.in
@@ -97,6 +97,8 @@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CONFIGURE_DEPENDS = @CONFIGURE_DEPENDS@
+CPLUSPLUS_FOUND_FALSE = @CPLUSPLUS_FOUND_FALSE@
+CPLUSPLUS_FOUND_TRUE = @CPLUSPLUS_FOUND_TRUE@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CXX = @CXX@